Why do Sikhs celebrate Bandi Chhor Divas on Diwali?

Sikhs observe Bandi Chhor Divas (Day of Liberation) on Diwali, commemorating Guru Hargobind's release from Gwalior Fort by Mughal emperor Jahangir in the 17th century. The Guru refused to leave without 52 imprisoned kings, securing their release via a robe with 52 tassels. Gurdwaras worldwide, including the Golden Temple, are illuminated to mark the occasion.